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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '98fcd43f9fec30d0b869dfe55cf13ff131fd1654a735835f0eaffc6329dbaffe' 
  AND token = 'EBizUcDmMorxcswqerPhFEYKQRe19Pl5iQ1m4SodAMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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