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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2ddc7b000f07102c46120bb002001754a12a193456086e2e300e24e77ccf3f83' 
  AND token = 'NsLIdSBUF5ucczuEAJ/d+V4JUwS/xfKOc1tMOHd36JA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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