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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7efb2d2e9e7774704a5d069d6bab80c1033ca1e6d6835ab7b8b486e3f9d859e5' 
  AND token = 'VvE7HyUJCZ8d0eD3E+XUfR92K4PJqlHBnObOpDRTVV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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