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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '70bfb5578686d5a641161b3333ded4d913937698b9faad062f25b50365914a89' 
  AND token = 'UnCfR4YCPp+r3HOW1UuPWTQEcLhWQd4hfe4gqNoxffY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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