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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4cf204a87962fd2a61e8605e4f9db1761a687425b84700d42c4454e710a34ac7' 
  AND token = 'X412c5Nxk87QL4UNlV0PbAfYzWHbqHppI4AQ5aulOhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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