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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f9042381165780f35757639f8a74d831de875fed42f9275ee94aa7ca9e05aa3f' 
  AND token = 'cn6z1I2u2/061YEjlaiExDF64BLOHHwI8LerIfRigjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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