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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '23dfa7da83aa543e4e8a00dd7db6cf3ab4a521dc9fd6efb041655702ab5538a0' 
  AND token = 'CN3nR3/FwzAT+Kiw4QeMIM4ZOzxorvk0BUw9xM7I3Tg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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