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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e8a09abd7ba423cdcc266580591662bf4b88ce1328965d63d25138d0e12e3d54' 
  AND token = 'JkuMJoEDevFWq34LxI8Lqy2pNIwogzoK1kxOzGHFo8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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