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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0ba897a90fe95ee924665bd65f860796104041838f8502c9d16bfda0d2ac4fa4' 
  AND token = 'XpA4kbRNu4BzrXM+rICkLCXIafQN0aIeLIjxVZffCpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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