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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '794ba206722aeb35e8486b0791b3cff5ae6bf788873da0e6dfaae5c4cbe584ff' 
  AND token = '65eoY/V7etmE1+9ytSuwXyr6yi+1p0EvCyWE5pwPHzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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