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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cda10fd423e72f9d01bbe32a58012a6fe17e75a6e78907d89f6753438d7c44ce' 
  AND token = '6b6Um7JuLeOzS6xcscxmwOMVEhgfxHGjt1X3yWjvOo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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