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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dc6f9bb42c599dc13ef779db71734aae3d5a5bcb9e41bda6df254e35d1a3e3cc' 
  AND token = '6nM+VuMCdvpZG/n6LfqWc4FJuL4SI/hfvSJRVSvpP9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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