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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1164f3ae9c798303709b8ec9659c7a787edb94da36071fea609d60a1e7772d5b' 
  AND token = '3yJC2iGI7dftFqq398hH88Kk0aaqXMBnLcYf5W83uMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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