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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e0fd62f85185819c1f66ec502c1c07985ad84e3c03e952b08d932193587a6ad1' 
  AND token = 'UcTKF7Ds+/b+9cRhODZk++Inkso9Exfqf3j3WlfKrBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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