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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '76fc009b66ad133f9e1f00e0d7ae19812e94a1fbf175b0c0e445fac1a5caf255' 
  AND token = '5b8x1/ms7dzoKKN0zbz0VkQHr4CBbP570q7JEAcAFzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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