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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '210405e6730606deb2dc4df55f9e62fc1b64657bdc1783e9029f776003407670' 
  AND token = 'i1/MoYseyfGdtCy/WwAC7rnpToGQyUQTSER7MVTiZMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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