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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '64521e4dae34fedf3a9fc0d98667b4a837a7c05d3cc3272c08a24f90d861c7a5' 
  AND token = 'lh4AUTpipFTJUY0G3ZoyFHUDthfh0K0iz17Dewax8es=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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