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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8f9a3bd7c3c2bb1954110a3b0d1993c7f7ba7e2135c702da1347c27b627ac814' 
  AND token = 'v/CuQ6LovNTTMaEAFpDjsTEyEl/EZDVY/3LIct3gJoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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