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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ec5543a0643e337b87ead326297c462bc4ebff888c9f79213acc25d6417e51f7' 
  AND token = '6evaG4Gfu5o3EFzqilSCkuiu5cHz77nz2fOrB/saj80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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