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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ab7a62b09f9c155ab1feb83cad2a217452dfe30ce6ab39b6250f2c9fa333ea9d' 
  AND token = 't3KEyJzF0nqOZibOxKMONoN8Zx2s5KVQqH/WKOadslQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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