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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9b4f214c30627d639bb2891be0ef3879ea6db71c4c419febb371f53ad9638b34' 
  AND token = 'YiM3mS+096yEg2xprdGl8Y+h7wrnseCwNLV77apZElM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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