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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4636e02c1361fc621f53846377f6fe96f54825cafafe4f93ef983f936574409a' 
  AND token = 'Tfpi2V3UmIoAAgsrRGrE0vq/g0Jc8ZkK3iVaSPencZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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