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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '37642b5e4e48f4d0a4df7c07a0be12b35be76be5eac252bcbb012fb468ec71f1' 
  AND token = 'rEvxTX8vcPY7jbDTaTMlFckQgL7pT6YG/lJGYIng4mM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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