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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a62b837966307c9e2331a288823e185799ace174253c19596073e30fbbf5aa91' 
  AND token = 'PHAvJJMgZWo6GvrshMCALsMfZkS8jgAoA9KLcD8E1P4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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