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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '35e9a975b31085b16dbe7efa7a38b97ba47bae20a1b1dc034b7ccfb73a376830' 
  AND token = 'O8rXi3/bzGOheKt1z5GC0BP9Xo56XwOQKT2DrXMqoKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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