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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '651412259e92822b188fa3a7e531c05045da56abaf77fdebf6163e6441c449b5' 
  AND token = 'eC4nO01QZSaMyLVVkwES5r7+1e3NfTtvfnhKNmhsiVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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