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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '714a4ebbe4050c123510d50c4c6e6368b2374f7a521c0b20638426af10b5053a' 
  AND token = 'UjUHhEY/jLDjXTetg4IILJkm7Tbbh6GT7D9ht3YJWWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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