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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'be65f8c620160fcced75f2252dcf4f7dbde3597052e0555e716e849052009890' 
  AND token = 'T4NicArMKh+XC/FQJI7x/ydl75aBP5FJJcn1aWBlCUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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