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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8f9ead3271e3ae6161f2d4a5c7e5538cafb68d1b43bc7af80569d0e6e87b0d59' 
  AND token = 'iEMVgQv6myqQx9sGkMC7X1Ucca/leH77y0VXLjJMYLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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