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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0fdfca61b4fb5342fbd1bc74ea2ad6ca185422119bc39ed463afb4a088539ea4' 
  AND token = 'OSYG84bEdUSL+fTy5ANC745lfVI7ebliO+fJu8PFmYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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