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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2305c9929bba72c7d1561c52428f2bd8132db2b9e8b391409311a657b2672c13' 
  AND token = 'EJ0tZxKFMU3uFkpo+dYkMMwJ7XnEOdZWcYr2OrKS1aM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}