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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fc40ff7ce5d7b1be205817a5224e66176206acc0c515bc37ab4832276c47a502' 
  AND token = 'N87Qrr9AnZitIeqA3F0mkVqBS+yy0T9K9UVVqr7lC1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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