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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2f0c6a84ff616fe53c6b1bd0683f030b9d546d2ab5bfa449aa700006a64c7733' 
  AND token = 'Aq5HulebLW3ztSpfKDOS8kAlQM2IOaPf7Tj2mQJ3Nbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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