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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c2d2f8501a525db012b37e0ca13f5a19cc3ca768d2ce924538b43533e019941a' 
  AND token = 'MKPXdvzSG2zWqnp7eTUQ7BMYHyXFWrbU1e2XYlMpGqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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