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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a59cf85bcf23a38e4d601311570c575af109b487aa55241665dcb169cbaa9c8d' 
  AND token = '7rCsOMAvRFW+vCQTUWLFQC6+C7YJLL3wWMBvDm7XWWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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