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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '77d1866c5e2e6febd5b505871b39e8d361a8fa1f8fda6352a89a6d09d9edcb2e' 
  AND token = 'ktiaUXJg4r2ReaWvaVLFawQC8g5/6LgLTo5usEB+yyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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