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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5d1ed740fc451748147a99780ef4ee10c7c3e02bdccbe1a82324f18b9b3a52c5' 
  AND token = 'FEIWzz4u5z5i/FXXxlLe7QSWeV4SToT0rwQAF+38Myc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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