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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e23a712cf9ae83e8899e9ed3436c55536548d1ec94b22cc01028db35195d439d' 
  AND token = 'YmYvqPD3UMRGv6PjrFdJvmv7+sOt2w8q8kFGGDevROw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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