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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0687e9173f13b175bf01320d8fecc5b4a5f82df266a3d899057aa5e3e9025933' 
  AND token = 'hjsXziMpqsDF0f57OefLtw6p2fqwRrnjS1VoJDH+his=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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