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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a7dc4cda6403f039d5f2424ff77f373865c302dd13cd7d3e115cdb43d2c26be7' 
  AND token = '5XTp9Wym4zhUpT6ylY4BAY4SLMBfRX7Q7+X38Z0SV6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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