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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5b095518f536d3b321eb6151cec0bcfcf82a31d844c09c537fe4fd8f2041243d' 
  AND token = '0Ux5dTcp3ETBN9w8TZjB6n2s8mX3kx4xzw0si6c3ngM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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