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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7051ba76262302fbb2ddc93e18563a707ac2a38caca469d3dc655f348bee1898' 
  AND token = 'l9FNX2gymDGPguMpOQum6XrPJpIldZdFMHXL8yknIbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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