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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '03294eec607f204b65a7da62a1e38623804b4c5e0d68fc5b7d5afd35bda088d2' 
  AND token = '6QFHw7r6x7Jk4ml8F0Gv32uu1j2LR4I6enMtBScAxIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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