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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f5d1261218607026112e918870be3678e15a1305a62b9e23e9acb346d97181f4' 
  AND token = 'Fo5HDuXnWzcumR5Syxv2c95mTWayV9u7A0qwkLCvxDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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