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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '50e508b80840c47b14e405c6e26e4f25158c0e662f3a317b2369f39a18a76556' 
  AND token = 'pdUppf7SaBPD2/5EtNWpKHxQhS+s+YD1w51HWpy95/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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