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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c0fd0858fe3c01b1207c09f705604458d8d531704aa25b5f2aa7e094062b22c9' 
  AND token = '9MkPlcR/o99JaMq2BBZvXZ+5dN7RTgcbn6xViANTVFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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