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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1702232b8113a1b8e920cf001b31fae33e5df454fc1b509edce87b7ad3c7fb7a' 
  AND token = '/0Qifmk+g5+G5UYPINL+vuc9i4/jAeP/jH2WVJiMfVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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