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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4a0ab364245e1771fe8f9deb7f15fc17e1a8bdb6bcc3bb29b5dddedaff72080d' 
  AND token = 'JMRZXDWmuRhRI/imLiLPo9Y8HCK+Ze4OKJ7m9pTsmF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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