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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2f1f8f8618c6f0310debe54bdf03e526b5969fcb38d49cba6b977ac4bd8a49f4' 
  AND token = 'D14Axe/cVU8O6YFULsd2GCPbgYus0k7OWbbgQ1ciRRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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