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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e0d16dbd7e1ff03c1c34842f04f24ada4c688c4f8d5d8c99ee53358d78dc968d' 
  AND token = 'btPo+dq+5MFf1j8g6o3bSFXSNQ8DIavXL73blkHuxXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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