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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6677e1569493f521f574aea5bf259173b7e4474d6fd5095a7b3df4a25ff210d3' 
  AND token = 'HrpadTy5u0YvP7LOwZpxM0iAFdRzzrz3yJkff6VRaEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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