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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '342fbc62e884f4ea7cbbc39e624db14d30a89afdd43da3dda11d0886dcd63184' 
  AND token = 'Y0kcs+pNenHXHDuDL+9zgoqQSD+ifNG/ywE/oxh48o4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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