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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a21301567c379f0a50e38a4e52a7e66d4ef9528ad1fd81a52a07703f5eea4e58' 
  AND token = '0QPTEqajgzwYw5EDtqho/YntK6kVSIlnMeeX+iz5Ky4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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