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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '233d75d380f83f7994e855c55b0c6541af7ff9292cf72dd7d73ab3f56ec03605' 
  AND token = '9/qKx2gpXo5S7fVW02lFynx5Od7PixUBx2OFF3/Q7j8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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