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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '503ed7b3aff44a8e75e30e4d3c773ba532ecd4e653c08098c1e45ead5fab09ee' 
  AND token = 'Kxt2F3EnDYC11x/CnM8eEoQ7GPhhse9cAaEBkunjZ5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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