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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4296a4e4150a8df75a95b9ae5d92e65466ec9f49e590b48391e92abf447cf7b9' 
  AND token = 'EIAU0uOld3Kjmlpeo42f8Fpi7KdJRwFIK/y5th3Q7qk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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