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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '19b23a4d6d245a8181d9b2e27d2e05a7f92163df6d8bd0c01a4b48194198f7ab' 
  AND token = 'OgrTBT+mAR6kwuGLNWQ/LtpCiD2Ou1bb2urR94GCDYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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